CVE-2026-33032: exploitation status and patch state
CVE-2026-33032 · CVSS 9.8 CRITICAL · EPSS 38%
Nginx UI is a web user interface for the Nginx web server. In versions 2.3.5 and prior, the nginx-ui MCP (Model Context Protocol) integration exposes two HTTP endpoints: /mcp and /mcp_message. While /mcp requires both IP whitelisting and authentication (AuthRequired() middleware), the /mcp_message endpoint only applies IP whitelisting - and the default IP whitelist is empty, which the middleware treats as "allow all". This means any network attacker can invoke all MCP tools without authentication, including restarting nginx, creating/modifying/deleting nginx configuration files, and triggering automatic config reloads - achieving complete nginx service takeover. At time of publication, there are no publicly available patches.
Is CVE-2026-33032 exploited?
Not in the CISA KEV catalog.
EPSS puts exploitation in the next 30 days at 38%.
Public exploit code: none found in monitored sources.